Cold, barren, and lifeless, the Red Planet is no substitute for the Blue Marble.
Once dependable water sources are growing more volatile in a destabilized climate.
To understand the gigaton is to understand the impact humans are having on the planet.
How a handful of human generations have transformed the surface of the planet.
We can't return to the climate we knew, but we can prevent an unbearable future.
Extinctions marked by human influence are not new. They began in the stone age.
How mountain belts travel through time and around the globe.
The climate of the near future may look like the distant past.